Subject: [ASA-201609-28] lib32-openssl: denial of service

Arch Linux Security Advisory ASA-201609-28
==========================================

Severity: Medium
Date    : 2016-09-27
CVE-ID  : CVE-2016-7052
Package : lib32-openssl
Type    : denial of service
Remote  : Yes
Link    : https://security.archlinux.org/AVG-34

Summary
=======

The package lib32-openssl before version 1:1.0.2.j-1 is vulnerable to
denial of service.

Resolution
==========

Upgrade to 1:1.0.2.j-1.

# pacman -Syu "lib32-openssl>=1:1.0.2.j-1"

The problem has been fixed upstream in version 1.0.2.j.

Workaround
==========

None.

Description
===========

A bug fix which included a CRL sanity check was added to OpenSSL 1.1.0
but was omitted from OpenSSL 1.0.2i. As a result any attempt to use
CRLs in OpenSSL 1.0.2i will crash with a null pointer exception.
The issue was reported to OpenSSL on 22nd September 2016 by Bruce
Stephens and Thomas Jakobi.

Impact
======

A remote attacker is able to perform a denial of service attack by
using a certificate revocation list.

References
==========

https://www.openssl.org/news/secadv/20160926.txt
https://security.archlinux.org/CVE-2016-7052